On Wed, 2010-08-18 at 21:56 +0200, ext USA Linux UAE wrote:
> Hello,
> I downloaded latest ks from code drop and build an image from
> scratch.
> Flashed the image to meeg_qemu_nand.img using qflasher and booted
> into qemu.
> Everything goes fine and as soon as i enter my user name and password
> this is the error i get before getting the command prompt.
> MeeGo release 1.0.80 (MeeGo)
> Kernel 2.6.35-11.2-n900 on an armv7l
>
> localhost.localdomain login: root
> Password:
> [ 258.663513]
> [ 258.664093] ===================================================
> [ 258.680725] [ INFO: suspicious rcu_dereference_check() usage. ]
> [ 258.686157] ---------------------------------------------------
> [ 258.691711] kernel/signal.c:660 invoked rcu_dereference_check()
> without protection!
> [ 258.697631]
> [ 258.697662] other info that might help us debug this:
> [ 258.697692]
> [ 258.714599]
> [ 258.714630] rcu_scheduler_active = 1, debug_locks = 0
> [ 258.724090] 1 lock held by login/734:
> [ 258.729003] #0: (tasklist_lock){.+.+..}, at: [<c005fafc>]
> kill_pgrp+0x1c/0x48
> [ 258.736206]
> [ 258.736236] stack backtrace:
> [ 258.748199] [<c003069c>] (unwind_backtrace+0x0/0xe4) from
> [<c005dea0>] (check_kill_permission+0xb4/0x168)
> [ 258.759094] [<c005dea0>] (check_kill_permission+0xb4/0x168) from
> [<c005fa4c>] (group_send_sig_info+0x14/0x44)
> [ 258.771972] [<c005fa4c>] (group_send_sig_info+0x14/0x44) from
> [<c005fabc>] (__kill_pgrp_info+0x40/0x64)
> [ 258.783966] [<c005fabc>] (__kill_pgrp_info+0x40/0x64) from
> [<c005fb10>] (kill_pgrp+0x30/0x48)
> [ 258.791687] [<c005fb10>] (kill_pgrp+0x30/0x48) from [<c018dccc>]
> (disassociate_ctty+0x12c/0x224)
> [ 258.799835] [<c018dccc>] (disassociate_ctty+0x12c/0x224) from
> [<c018ddf8>] (no_tty+0x34/0x58)
> [ 258.808776] [<c018ddf8>] (no_tty+0x34/0x58) from [<c018e210>]
> (tty_ioctl+0x3f4/0x6ec)
> [ 258.816711] [<c018e210>] (tty_ioctl+0x3f4/0x6ec) from [<c00cb628>]
> (vfs_ioctl+0x2c/0xac)
> [ 258.824829] [<c00cb628>] (vfs_ioctl+0x2c/0xac) from [<c00cbec4>]
> (do_vfs_ioctl+0x29c/0x2b8)
> [ 258.834197] [<c00cbec4>] (do_vfs_ioctl+0x29c/0x2b8) from
> [<c00cbf14>] (sys_ioctl+0x34/0x54)
> [ 258.842468] [<c00cbf14>] (sys_ioctl+0x34/0x54) from [<c002bf40>]
> (ret_fast_syscall+0x0/0x3c)
>
> is this only on qemu or on n900 itself??
This bug is fixed by following commit which in included in 2.6.35.1:
commit 694f690d27dadccc8cb9d90532e76593b61fe098
Author: David Howells <dhowe...@redhat.com>
Date: Wed Aug 4 16:59:14 2010 +0100
CRED: Fix RCU warning due to previous patch fixing __task_cred()'s
checks
Since meego kernel is now based on 2.6.35.2, you shouldn't see this
message.
Cheers,
Ameya.
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